火灾下预应力网架结构的力学性能  

Mechanical Performance Analysis of Prestressed Space Grid Structure under Fire

作　　者：王广勇[1] 郑蝉蝉[1] 张东明[1] 

机构地区：[1]中国建筑科学研究院,北京100013

出　　处：《建筑科学》2013年第7期80-84,共5页Building Science

基　　金：中国建筑科学研究院自筹资金资助项目(20110111330730002;20110106330730001)

摘　　要：本文建立了考虑火灾升温和升降温作用下预应力网架结构力学性能的有限元模型,并对预应力网架的变形模式、预应力索拉应力随受火时间的变化规律进行了研究。结果表明,预应力网架经历升降温火灾后,残余变形较大,索中拉应力增加,因此对其进行火灾安全设计时应考虑降温阶段结构破坏的可能性。A finite element model of the mechanical performance of prestressed grid structures considering heating and cooling is proposed,and deformation mode,stress redistribution of the prestressed cable during fire are also studied.The results show that remainder deformation can't be ignored,and stress of the cable turns bigger when the fire temperature drops to ambient temperature.The research shows that collapse possibility during the cooling phase should be considered when designing fire safety of prestressed grid structures.

关 键 词：升降温 火灾 预应力网架结构 

分 类 号：TU356[建筑科学—结构工程]